Community Forum

Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Request, B

Highlighted
Frequent Visitor

Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Request, B

Hi, I have been having extremely slow speed and unstable insternet since the service started. I'm using TP-Link CR1900 which is a compatible model, modem and router in one. It's connected to the cable from the wall. There is no splitter . I moved to a new house in September and Comcast is the first provider. The new cables were wired in and out  done by the builder and Comcast. I ordered 300Mbps but the speed rarely closed to it. Most of day and night, the download speed is like moving between 0- 10Mbps while the upload speed is pretty steady bewteen 11-12 Mbps. Always failed to download even few MB size. I tried to have chat service with Tech department but not resolved. They requested only re-boot the modem.  Looking at the the log, it doens't seem to be a modem issue. What do I need to do? Any suggestion?

 

 

System Log

 

 

Time Priority Description
TimePriorityDescription
Fri Oct 23 20:48:07 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:54:11 2020Notice (6)Honoring MDD; IP provisioning mode = IPv6
Wed Oct 21 15:53:54 2020Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:43 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:53:34 2020Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:30 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:53:14 2020Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:53:02 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Wed Oct 21 15:52:56 2020Critical (3)Received Response to Broadcast Maintenance Request, But no Unicast Maintenance opportunities received - T4 time out;CM-MAC=c...
Wed Oct 21 15:52:52 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Tue Oct 20 21:54:43 2020Warning (5)Unicast DSID PSN startup error
Time Not EstablishedNotice (6)Honoring MDD; IP provisioning mode = IPv6
Tue Oct 20 12:42:39 2020Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC={removed};CMTS-MAC={removed}...

 

Start Up Procedure

Procedure Status Comment
ProcedureStatusComment
Acquire Downstream Channel451750000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOKd11_m_cr1900_speedtierextreme2_c01.cm
SecurityEnabledBPI+

 
Downstream Bonded Channels

Channel Status Modulation Channel ID Frequency Power SNR
ChannelStatusModulationChannel IDFrequencyPowerSNR
1LockedQAM2561451750000 Hz-12.9 dBmV37.5 dB
2LockedQAM2562457750000 Hz-13.0 dBmV37.5 dB
3LockedQAM2563463750000 Hz-13.0 dBmV37.3 dB
4LockedQAM2564469750000 Hz-13.1 dBmV37.3 dB
5LockedQAM2565475750000 Hz-12.5 dBmV38.1 dB
6LockedQAM2566481750000 Hz-12.6 dBmV37.9 dB
7LockedQAM2567487750000 Hz-12.8 dBmV37.7 dB
8LockedQAM2568493750000 Hz-12.8 dBmV37.7 dB
9LockedQAM2569499750000 Hz-12.6 dBmV33.5 dB
10Not Lockedunknown10505750000 Hz-12.7 dBmV0.0 dB
11Not Lockedunknown11511750000 Hz-12.8 dBmV0.0 dB
12LockedQAM25612517750000 Hz-13.0 dBmV29.2 dB
13LockedQAM25613523750000 Hz-12.5 dBmV33.8 dB
14LockedQAM25614529750000 Hz-12.6 dBmV37.3 dB
15LockedQAM25615535750000 Hz-12.7 dBmV36.5 dB
16LockedQAM25616541750000 Hz-12.8 dBmV34.3 dB
17LockedQAM25617547750000 Hz-11.8 dBmV34.7 dB
18LockedQAM25618553750000 Hz-11.8 dBmV31.6 dB
19LockedQAM25619559750000 Hz-11.9 dBmV33.0 dB
20LockedQAM25620565750000 Hz-12.0 dBmV31.8 dB
21LockedQAM25621571750000 Hz-11.8 dBmV38.2 dB
22Not Lockedunknown22577750000 Hz-11.9 dBmV0.0 dB
23LockedQAM25623583750000 Hz-12.0 dBmV26.5 dB
24Not Lockedunknown24589750000 Hz-12.0 dBmV0.0 dB
Upstream Bonded Channels

 

Channel Status Channel Type Channel ID Symbol Rate Frequency Power

ChannelStatusChannel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA55120 ksym/sec36500000 Hz49.8 dBmV
2LockedATDMA65120 ksym/sec30100000 Hz49.8 dBmV
3LockedATDMA75120 ksym/sec23700000 Hz48.3 dBmV
4LockedATDMA85120 ksym/sec17300000 Hz48.3 dBmV
5Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV

 

 

Sometimes downstream info is empty like below.

 

Downstream Bonded Channels

Channel Status Modulation Channel ID Frequency Power SNR
ChannelStatusModulationChannel IDFrequencyPowerSNR
--------------
 

 

Highlighted
Diamond Problem Solver

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

Basically, your downstream signal is trashed. Too low, out of spec and non-existent SNR on some channels. Can you take your modem to your demarcation before any splitters and test your levels again. Its the difference between an inside or outside issue. Age of cables don’t really matter, they can go bad anytime

I am a Retired Official Comcast Employee
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark a post as the Best Answer!
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

Thank you for your reponse. I connected the modem to the black cable before the splitter in the utility room.  Here's what I captured. Now things changed. 

 

 

Start Up Procedure

ProcedureStatusComment
Acquire Downstream Channel547750000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOKd11_m_cr1900_speedtierextreme2_c01.cm
SecurityEnabledBPI+

 
Downstream Bonded Channels

ChannelStatusModulationChannel IDFrequencyPowerSNR
1LockedQAM25617547750000 Hz-1.7 dBmV40.1 dB
2LockedQAM2561451750000 Hz-2.3 dBmV40.1 dB
3LockedQAM2562457750000 Hz-2.4 dBmV40.1 dB
4LockedQAM2563463750000 Hz-2.5 dBmV39.9 dB
5LockedQAM2564469750000 Hz-2.5 dBmV40.0 dB
6LockedQAM2565475750000 Hz-1.9 dBmV40.4 dB
7LockedQAM2566481750000 Hz-2.0 dBmV40.3 dB
8LockedQAM2567487750000 Hz-2.1 dBmV40.3 dB
9LockedQAM2568493750000 Hz-2.2 dBmV40.3 dB
10LockedQAM2569499750000 Hz-1.8 dBmV40.7 dB
11LockedQAM25610505750000 Hz-1.9 dBmV37.7 dB
12LockedQAM25611511750000 Hz-2.0 dBmV40.4 dB
13LockedQAM25612517750000 Hz-2.1 dBmV39.9 dB
14LockedQAM25613523750000 Hz-1.7 dBmV40.0 dB
15LockedQAM25614529750000 Hz-1.8 dBmV39.9 dB
16LockedQAM25615535750000 Hz-1.8 dBmV40.0 dB
17LockedQAM25616541750000 Hz-0.9 dBmV41.3 dB
18LockedQAM25618553750000 Hz-0.7 dBmV41.3 dB
19LockedQAM25619559750000 Hz-0.7 dBmV41.3 dB
20LockedQAM25620565750000 Hz-0.7 dBmV41.4 dB
21LockedQAM25621571750000 Hz-0.3 dBmV41.4 dB
22LockedQAM25622577750000 Hz-0.4 dBmV41.3 dB
23LockedQAM25623583750000 Hz-0.4 dBmV41.4 dB
24LockedQAM25624589750000 Hz-0.4 dBmV41.4 dB
 
 
Upstream Bonded Channels

 

ChannelStatusChannel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA55120 ksym/sec36500000 Hz41.8 dBmV
2LockedATDMA65120 ksym/sec30100000 Hz41.8 dBmV
3LockedATDMA75120 ksym/sec23700000 Hz41.8 dBmV
4LockedATDMA85120 ksym/sec17300000 Hz40.3 dBmV
5Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
Highlighted
Expert

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

Obviously, there is too much signal loss with the splitter / wiring / hardware.



I am not a Comcast Employee.
I am a Customer Expert volunteering my time to help other customers here in the Forums.
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark the post as Best Answer!
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

Umm, the splitter was connected by the Comcast technician on September 29. Can it be a bad one? Should I call a tech to check further? In-house wiring belongs to the builder. I'm afraid what I should do if it's a cause of the problem. What can be a hardware issue? Do you mean the modem?

Can you please advise where I should start? 

Highlighted
Diamond Problem Solver

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

What type of splitter? What other services do you have? Try the modem again where you had it originally and see if anything changed when you took the cables off.

I am a Retired Official Comcast Employee
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark a post as the Best Answer!
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

It's HomeConnect® Four-way Splitter with red color lable.  I have Blast internet service.

 

SV4G  HomeConnect® Four-way Splitter, 5–1002 MHz

 

I place the modem on the 1st floor and the splitter is located in the basement.  Do you mean taking off all the cables from the splitter but the one connected to the modem?

 

Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

I have the internet service only. I didn't try to disconnect three cables to connected to other rooms and none of them are used. 

Highlighted
Diamond Problem Solver

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

If all you have is internet, the splitter isn’t necessary. Removing it will, increase your downstream levels and decrease your upstream levels by about 7db. It may not be the solution but it’s a starting point

I am a Retired Official Comcast Employee
We ask that you post publicly so people with similar questions may benefit from the conversation.
Was your question answered? Mark a post as the Best Answer!
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

I ordered a 3GHz rated RG6  cable extension to remove the splitter and connect the first cable to the house and the cable wired to the room where the modem is placed. Hope this reduces signal leakage. Will see how it makes difference and post the result. Thanks!

Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

I connected two cables directly with the extension.  Here's the connection information. It's changed as you indicated.  Still hard to believe that the new splitter is bad. Good thing is, I do not need to use the splitter. Thank you so much!

 

Start Up Procedure

ProcedureStatusComment
Acquire Downstream Channel571750000 HzLocked
Connectivity StateOKOperational
Boot StateOKOperational
Configuration FileOKd11_m_cr1900_speedtierextreme2_c01.cm
SecurityEnabledBPI+

 
Downstream Bonded Channels

ChannelStatusModulationChannel IDFrequencyPowerSNR
1LockedQAM25621571750000 Hz-5.1 dBmV40.2 dB
2LockedQAM2561451750000 Hz-5.3 dBmV40.0 dB
3LockedQAM2562457750000 Hz-5.4 dBmV39.9 dB
4LockedQAM2563463750000 Hz-5.5 dBmV39.8 dB
5LockedQAM2564469750000 Hz-5.5 dBmV39.9 dB
6LockedQAM2565475750000 Hz-4.9 dBmV40.3 dB
7LockedQAM2566481750000 Hz-5.0 dBmV40.2 dB
8LockedQAM2567487750000 Hz-5.2 dBmV40.1 dB
9LockedQAM2568493750000 Hz-5.2 dBmV40.1 dB
10LockedQAM2569499750000 Hz-4.9 dBmV33.9 dB
11LockedQAM25610505750000 Hz-5.1 dBmV29.1 dB
12LockedQAM25611511750000 Hz-5.2 dBmV35.8 dB
13LockedQAM25612517750000 Hz-5.3 dBmV37.7 dB
14LockedQAM25613523750000 Hz-4.8 dBmV39.7 dB
15LockedQAM25614529750000 Hz-4.9 dBmV40.2 dB
16LockedQAM25615535750000 Hz-5.0 dBmV40.2 dB
17LockedQAM25616541750000 Hz-4.2 dBmV40.8 dB
18LockedQAM25617547750000 Hz-4.0 dBmV40.8 dB
19LockedQAM25618553750000 Hz-4.0 dBmV40.3 dB
20LockedQAM25619559750000 Hz-4.0 dBmV40.3 dB
21LockedQAM25620565750000 Hz-4.2 dBmV40.4 dB
22LockedQAM25622577750000 Hz-4.1 dBmV39.5 dB
23LockedQAM25623583750000 Hz-4.1 dBmV37.8 dB
24LockedQAM25624589750000 Hz-4.1 dBmV38.0 dB
 
Upstream Bonded Channels

 

ChannelStatusChannel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA75120 ksym/sec23700000 Hz41.3 dBmV
2LockedATDMA55120 ksym/sec36500000 Hz42.8 dBmV
3LockedATDMA65120 ksym/sec30100000 Hz41.3 dBmV
4LockedATDMA85120 ksym/sec17300000 Hz41.3 dBmV
5Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

It looks the problem came back.  Download unsteady and slow. Upload same as before.  I 'm going to try to connect the modem in other room without splitter.  Sigh

 
System Log

TimePriorityDescription
Thu Nov 05 13:50:49 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC={removed};CM-QOS=1.1;CM-VER=3.0;
Thu Nov 05 10:31:47 2020Critical (3)Started Unicast Maintenance Ranging - No Response received - T3 time-out;CM-MAC={removed};CMTS-MAC={removed}...
Thu Nov 05 10:31:45 2020Warning (5)MDD message timeout;CM-MAC={removed};CMTS-MAC=2{removed};CM-QOS=1.1;CM-VER=3.0;

 

Downstream Bonded Channels

ChannelChannelModulationChannel IDFrequencyPowerSNR
1LockedQAM25621571750000 Hz-6.3 dBmV39.7 dB
2LockedQAM2561451750000 Hz-6.2 dBmV39.4 dB
3LockedQAM2562457750000 Hz-6.3 dBmV39.5 dB
4LockedQAM2563463750000 Hz-6.3 dBmV39.0 dB
5LockedQAM2564469750000 Hz-6.4 dBmV39.4 dB
6LockedQAM2565475750000 Hz-5.8 dBmV39.9 dB
7LockedQAM2566481750000 Hz-5.9 dBmV39.4 dB
8LockedQAM2567487750000 Hz-6.2 dBmV39.7 dB
9LockedQAM2568493750000 Hz-6.1 dBmV39.7 dB
10Not Lockedunknown9499750000 Hz-5.6 dBmV0.0 dB
11Not Lockedunknown10505750000 Hz-5.4 dBmV0.0 dB
12Not Lockedunknown11511750000 Hz-6.1 dBmV0.0 dB
13Not Lockedunknown12517750000 Hz-6.3 dBmV0.0 dB
14LockedQAM25613523750000 Hz-5.9 dBmV31.5 dB
15LockedQAM25614529750000 Hz-6.0 dBmV34.2 dB
16LockedQAM25615535750000 Hz-6.2 dBmV32.8 dB
17LockedQAM25616541750000 Hz-5.4 dBmV30.5 dB
18LockedQAM25617547750000 Hz-5.4 dBmV31.2 dB
19LockedQAM25618553750000 Hz-5.4 dBmV26.7 dB
20LockedQAM25619559750000 Hz-5.4 dBmV31.1 dB
21LockedQAM25620565750000 Hz-5.7 dBmV27.6 dB
22Not Lockedunknown22577750000 Hz-5.5 dBmV0.0 dB
23Not Lockedunknown23583750000 Hz-5.5 dBmV0.0 dB
24Not Lockedunknown24589750000 Hz-5.5 dBmV0.0 dB
 
Upstream Bonded Channels

 

ChannelStatusChannel TypeChannel IDSymbol RateFrequencyPower
1LockedATDMA75120 ksym/sec23700000 Hz43.8 dBmV
2LockedATDMA55120 ksym/sec36500000 Hz44.8 dBmV
3LockedATDMA65120 ksym/sec30100000 Hz44.3 dBmV
4LockedATDMA85120 ksym/sec17300000 Hz41.8 dBmV
5Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
6Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
7Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
8Not LockedUnknown00 ksym/sec0 Hz0.0 dBmV
Highlighted
Frequent Visitor

Re: Very slow internet speed, MDD message timeout, Received Response to Broadcast Maintenance Reques

I placed the modem in other room and monitored 4 days. Surprisingly no error has been logged. System log is clean so far and the connection information is good. Eveything works good.  That says the cable wired to the original place causes loose signal. I'm wondering how it can be fixed or replaced thourgh the wall. It's good to have at least one working though it's not in the best location for wifi.